Acoustic Foam XL Bass Trap Studio Soundproofing Corner Wall 12" X 12" X 12" (4 PACK) High Quality foam bass traps will help eliminate reverb and unwanted sound in any studio Professional design, aimed to target the low/mid frequencies Helps Eliminate reverb and echoes of bass sounds Versatile and fits any room! MADE IN USA - Fire Retardant: CA Technical Bulletin 117